udp 抛出ava.lang.IllegalArgumentException异常

[jeiwt]

下面的程序是简单的UDP，Client端发送了一个Long，Server端接收并显示Long值

Client端

public class Client {

	private static SocketAddress address;

	private static String host = "127.0.0.1";

	private static int port = 5678;

	private static byte[] buf;

	public Client() {
		address = new InetSocketAddress(host, port);
	}

	public static void main(String args[]) {
		Long l = 123456789L;

		ByteArrayOutputStream bs = new ByteArrayOutputStream();
		DataOutputStream data = new DataOutputStream(bs);
		try {
			data.writeLong(l);
			buf = bs.toByteArray();
			// address = new InetSocketAddress(host, port);
			DatagramSocket ds = new DatagramSocket(6666);
			DatagramPacket dp = new DatagramPacket(buf, buf.length, address);
			ds.send(dp);
			ds.close();
		} catch (SocketException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

当把address = new InetSocketAddress(host, port);写在构造函数中就会抛出
Exception in thread "main" java.lang.IllegalArgumentException: unsupported address type
at java.net.DatagramPacket.setSocketAddress(Unknown Source)
at java.net.DatagramPacket.<init>(Unknown Source)
at java.net.DatagramPacket.<init>(Unknown Source)
at socket.study.udp.Client.main(Client.java:27)
当把address = new InetSocketAddress(host, port);写在main中就没问题

为什么了？？

下面是Server端
Server端

public class Server {

	private static int port = 5678;

	private static byte[] buf;

	public static void main(String[] args) {

		buf = new byte[1000];
		DatagramPacket dp = new DatagramPacket(buf, buf.length);
		ByteArrayInputStream bs = new ByteArrayInputStream(buf);
		DataInputStream data = new DataInputStream(bs);

		try {
			DatagramSocket ds = new DatagramSocket(port);
			ds.receive(dp);
			System.out.println(data.readLong());
		} catch (SocketException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

[yingchunmei]

因为你的 private static SocketAddress address 这段代码中address 对象申明的是静态的你把它放在构造方法里面肯定不行了撒！同理main 方法是静态的所以可以

[jeiwt]

OK，结贴。看来自个想问题太不仔细了...